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I snapped some beautiful pictures of a back-lit leaf belonging to my Ficus lyrata (fiddle leaf fig) tree. Can anyone tell me what I'm looking at here? Am I seeing individual cells in between the fine translucent lines (which I am assuming are veins of various sizes filled with fluid and no chlorophyll)? Also, what are the tiny, translucent dots everywhere? Vacuoles, perhaps? If those are vacuoles, then each should belong to a single cell, correct?

You've got the idea right, but your scale is off. Yes the lines are veins for transporting fluid, but individual cells are quite a bit smaller and would require a microscope. Plus a leaf is many cell layers thick so you won't see just one unless you carefully peel it apart. Not sure what the white spots are.